linux-kernel - Re: [PATCH] of: introduce event tracepoints for dynamic device

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Message-ID: <20170418224657.1b7ed057@grimm.local.home>
Date:   Tue, 18 Apr 2017 22:46:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>, robh+dt@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nfont@...ux.vnet.ibm.com,
        mpe@...erman.id.au, mingo@...hat.com
Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node
 lifecyle

On Tue, 18 Apr 2017 17:07:17 -0700
Frank Rowand <frowand.list@...il.com> wrote:


> As far as I know, there is no easy way to combine trace data and printk()
> style data to create a single chronology of events.  If some of the
> information needed to debug an issue is trace data and some is printk()
> style data then it becomes more difficult to understand the overall
> situation.

You mean like:

 # echo 1 > /sys/kernel/debug/tracing/events/printk/console/enable

Makes all printks also go into the ftrace ring buffer.

-- Steve

> 
> If Rob wants to convert printk() style data to trace data (and I can't
> convince him otherwise) then I will have further comments on this specific
> patch.
>